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122 lines
3.8 KiB
122 lines
3.8 KiB
.\" Copyright (c) 1994, 1996, 1997 |
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.\" The Regents of the University of California. All rights reserved. |
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.\" |
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.\" Redistribution and use in source and binary forms, with or without |
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.\" modification, are permitted provided that: (1) source code distributions |
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.\" retain the above copyright notice and this paragraph in its entirety, (2) |
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.\" distributions including binary code include the above copyright notice and |
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.\" this paragraph in its entirety in the documentation or other materials |
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.\" provided with the distribution, and (3) all advertising materials mentioning |
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.\" features or use of this software display the following acknowledgement: |
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.\" ``This product includes software developed by the University of California, |
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.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
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.\" the University nor the names of its contributors may be used to endorse |
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.\" or promote products derived from this software without specific prior |
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.\" written permission. |
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
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.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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.\" |
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.TH PCAP_ACTIVATE 3PCAP "7 April 2014" |
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.SH NAME |
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pcap_activate \- activate a capture handle |
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.SH SYNOPSIS |
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.nf |
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.ft B |
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#include <pcap/pcap.h> |
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.ft |
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.LP |
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.ft B |
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int pcap_activate(pcap_t *p); |
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.ft |
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.fi |
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.SH DESCRIPTION |
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.B pcap_activate() |
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is used to activate a packet capture handle to look |
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at packets on the network, with the options that were set on the handle |
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being in effect. |
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.SH RETURN VALUE |
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.B pcap_activate() |
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returns 0 on success without warnings, a non-zero positive value on |
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success with warnings, and a negative value on error. |
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A non-zero return value indicates what warning or error condition |
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occurred. |
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.LP |
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The possible warning values are: |
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.TP |
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.B PCAP_WARNING_PROMISC_NOTSUP |
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Promiscuous mode was requested, but the capture source doesn't support |
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promiscuous mode. |
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.TP |
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.B PCAP_WARNING_TSTAMP_TYPE_NOTSUP |
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The time stamp type specified in a previous |
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.B pcap_set_tstamp_type() |
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call isn't supported by the capture source (the time stamp type is |
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left as the default), |
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.TP |
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.B PCAP_WARNING |
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Another warning condition occurred; |
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.B pcap_geterr() |
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or |
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.B pcap_perror() |
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may be called with |
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.I p |
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as an argument to fetch or display a message describing the warning |
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condition. |
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.LP |
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The possible error values are: |
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.TP |
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.B PCAP_ERROR_ACTIVATED |
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The handle has already been activated. |
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.TP |
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.B PCAP_ERROR_NO_SUCH_DEVICE |
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The capture source specified when the handle was created doesn't |
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exist. |
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.TP |
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.B PCAP_ERROR_PERM_DENIED |
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The process doesn't have permission to open the capture source. |
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.TP |
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.B PCAP_ERROR_PROMISC_PERM_DENIED |
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The process has permission to open the capture source but doesn't |
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have permission to put it into promiscuous mode. |
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.TP |
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.B PCAP_ERROR_RFMON_NOTSUP |
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Monitor mode was specified but the capture source doesn't support |
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monitor mode. |
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.TP |
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.B PCAP_ERROR_IFACE_NOT_UP |
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The capture source device is not up. |
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.TP |
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.B PCAP_ERROR |
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Another error occurred. |
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.B pcap_geterr() |
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or |
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.B pcap_perror() |
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may be called with |
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.I p |
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as an argument to fetch or display a message describing the error. |
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.LP |
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If |
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.BR PCAP_WARNING_PROMISC_NOTSUP , |
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.BR PCAP_ERROR_NO_SUCH_DEVICE , |
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or |
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.B PCAP_ERROR_PERM_DENIED |
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is returned, |
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.B pcap_geterr() |
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or |
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.B pcap_perror() |
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may be called with |
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.I p |
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as an argument to fetch or display an message giving additional details |
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about the problem that might be useful for debugging the problem if it's |
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unexpected. |
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.LP |
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Additional warning and error codes may be added in the future; a program |
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should check for positive, negative, and zero return codes, and treat |
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all positive return codes as warnings and all negative return |
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codes as errors. |
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.B pcap_statustostr() |
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can be called, with a warning or error code as an argument, to fetch a |
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message describing the warning or error code. |
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.SH SEE ALSO |
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pcap(3PCAP)
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